Nothing usually references to the absence of a desired outcome or instance or even the perception of a lack of something, like nothing being received on a radio or nothing was in the drawer. True nothing exists in absolute absence of something wich could only occur in the vacuum of outer space and even then there's things there, dust, tiny particles and other minuscule particulates float around in there.
and that's only the physical aspect of something, not including Energy or other non-physical affects of matter. Concepts and ideas are still a thing, such as the number 0. It truly represent's the total absence of something yet is a representation of what it is and is still a thing. Even -1 is a thing and it's even less than nothing, an owed something if you will. but such things have issues such as the square root of -1, wich is represented by 'i' but I digress.
nothing is in of itself a thing even if only in a representative sence, but if it can be represented by something then it must be something in of itself.